why does my Toyota Highlander XU70 (2020-Present) engine light keep flashing

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Addressing Ignition System Issues

• Spark Plug Replacement:

  • Remove the ignition coil(s) by unscrewing the retaining bolts and disconnecting electrical connectors.
  • Remove the old spark plugs using a spark plug socket and a ratchet. Check the gap on new spark plugs and install them.
  • Reinstall the ignition coils and reconnect electrical connectors.

• Ignition Coil Check:

  • Use a multimeter to test the resistance of the ignition coils. Replace any coils that fail the test.

3. Checking Fuel System

• Fuel Pressure Test:

  • Connect a fuel pressure gauge to the fuel rail's service port.
  • Start the engine and monitor the pressure. Compare the reading with manufacturer specifications; replace the fuel pump if the pressure is low.

• Fuel Filter Replacement:

  • If applicable, replace the fuel filter to ensure proper fuel flow.

4. Inspecting for Vacuum Leaks

• Visually inspect hoses connected to the intake manifold for cracks or disconnections.
• Use a smoke machine to identify any hidden vacuum leaks.
• Replace any damaged hoses.

5. Exhaust System Examination

• Inspect the exhaust for blockages, especially in the catalytic converter.
• If a blockage is suspected, perform a backpressure test using a gauge.